Planet Bike Eco bike rack Oversized, 6061 tubular aluminum rod for maximum strength and stability Open side rails to maximize heel clearance when packs are installed One size fits most frames,Pre-installed rack hardware for quick, hassle-free installation Load capacity 55 lbs,Rack weighs 648 grams Length of top of rack is 12.5 inches, width is 5.5 inches (top panel is 3 inches across), spacing between lower attachments is 5" Oversized silver aluminum rear rack for gear storage Ideal for attaching panniers and small bags/packs Made of oversized 6061 tubular aluminum for strength Open side rails maximize heel clearance while riding Fits 97 percent of all mountain and hybrid/road bike frames